Knife bar for paper cutting and folding machines



y Sept. 25, 1928. 1,685,532

H. F. BECHMAN KNIFE BAR FOR PAPER CUTTING AND FOLDING MACHINES FiledOct. l, 1927 AAlAAAA/AAAAAAIAAA A A A A AA AAAAAAAAA www Patented Sept.25, 1928.

UNITED STATES PATENT OFFICE.

i HENRY F. BECKMAN, OF BATTLE CREEK, MICHIGAN, ASSIGNOR T0 DUPLEXPRINTING PRESS COMPANY, OF BATTLE CREEK, MICHIGAN, A CORPORATION 0FMICHIGAN.

KNIFE BAR FOR PAPER CUTTING AND FOLDING MACHINES.

Application led October 1, 1927.

This invention is an improvement in knife bars for use in sheet and webcutting mechanisms and has particular reference to the yknife bars usedin the male cutting cylinders of rotary web cutting and foldingmechanisms. The invention consists in the iinproved construction of theso-called knife bar used in rotary folders and web cutting mechanisms,and its object is to provide means for bracing the knife blade againstlateral deflection under the severe side strains to which it issubjected by the action of the male and female cutting cylinders as theweb or webs to be severed are impinged and cut by the knife blade; andto strengthen the knifeblade by doing away with the slots ordinarilynecessarily provided in the present known knife bars.

I will explain the invention with reference to the accompanyingdrawings, which illustrate one practical embodiment thereof, andsummarize in the claims the essential features of the invention forwhich protection is desired.

In said drawings:

Figure 1 is a diagrammatic view of a pair of cutting and foldingcylinders equipped with my improved knife bar;

Fig. 2 is a partial side view of the improved knife bar detached;

Fig. 3 is a transverse section on the line 3--8, Fig. 2;

Fig. 4 is a similar section on the line 4 4, Fig. 2.

The male cutting cylinder A and the female cutting cylinder B may be ofany suitable kind, and operated as in an ordinary paper folding andcutting mechanism; or for example such as shown in my Patents No.1,102,637 or No. 1,203,464. The male cutting cylinder is equipped with aknife bar C, the knife being adapted to cooperate with a presser bar orbars D in the female cylinder B to sever the web or webs W passingtherebetween, as the cylinders are rotated.

In my invention the knife blade is preferably made in several sections1, closely fitted together endwise as shown in Fig. 2. The base of theknife blade is confined in recesses 2a in the opposed faces of boxmembers 2'which are securely fastened together by means of screws 3which pass through openings 2b in one box member and engage threadedopenings 2c in Serial No. 223,368,

also recessed, as indicated at 2e, at opposite sides of the upperportion of the blade, and in these recesses 2e are placed cheek pieces3a, which are usually of hard fibre. These cheek pieces are movable inthe recesses 2, and are normally pushed outward by means of springs 4(Fig. 3) which are preferably seated in sockets 2f in the box membersand press against the undersidey of the cheek pieces. The outwardmovement of the cheek pieces is limited by studs or pins 5 which areattached to the box members 2 and project into slots 3l in the cheekpieces, as illustrated in Fig. 3.

The inner end of the pins or studs 5 is adapted to contact with theadjacent sides of the knife blade, and the opposite pins 5 support orbrace the blade against lateral deflection. The cheek pieces 3a are notdesigned nor adapted n-or intended to laterally support the knife blade,but merely to enable the knife to properly engage the paper; and it isessential that the cheek pieces move relative to the knife when thelatter is operating.

In the ordinary knife bars the pins pass through slots in the knifeblade coincident with slots in the cheek pieces. In my improved knifebar there are no slots in the knife for passage of pins; and no pinspassing through through the knife, as in the old construction, for theinner ends of the pins 5 only extend to and contact with the sides ofthe knife plate and support or brace it at each side thereof, and do notextend therethrough.

My novel knife bar is particularly useful for high speed heavy duty webfolding and cutting mechanisms. In such machines there is considerablelateral pressure or strain exerted on the knife blade during the actualcutting operation. In the bars as heretofore used the upper or outerpart of the knife blade was supported only at the point where it isclamped between the box members and had no support against lateraldeflection, as the cheek pieces have to be free to move by action of thesprings. In my improved knife bar the pins 5 impinge against and supportthe knife blade at an appreciable distance from the blade clampingdevices. These pins bra-ce the knife against the side strains producedthereon as the cytinderskreliliftogetlieii, and the knife blade 4cessesin ,their opposed sides, means for fastening .the members together, aknife blade secured between the box members .extending between .therecesses Liii lSeid members and pins ,attached `to tlliefboiil membersat oppo site sides of the 'bl ade adapted to contact With V,the sides ofthe blade .and support the blade .against lateral deflection during thecutting liberation.y

2. Aknife bai' lfor the purpose specified,V

`comprising opposite fbex members provided with recesses lin theiropposed sides, means for fastening .the members together, a knife bladesecured between the members and intermediate the recesses7 cheek piecesinserted in the `members at opposite sides of the'knife blade, pinsattached to the opposite box niembers at opposite sides of the blade andadapted to Contact with opposite sides of the blade adjacent the cuttingedge tliroiighgand support the "blade against lat-eral deflection during 'the cutting operation.

3. Tliiewh-erein described lmife bei' for Vthe pui-pose specified.,contigrisiii-g...egpposite` 'box members having recesses inA theiropposed sides, mea-Lister clampiiiig it'l-iie members together, a knifeblade having its lower por tion clainped 'b5/and between the boxmeinbers and intermediate the recesses and its cutting edge extendingslightly iabeve .the box iiieinbers, cheek lpiecesinserted :iii .the boxiiiembers at opposite sides of the knife iblade and Vprovided withslots7 springs for forcing the cheek members outwardly and pins attached,to the box members at `opposite sides of the blade and engagingthe'slotsin the `cheek pieces to -limit the -outward movement thereof,.the yinner ends of opposite pins .being adapted to engage oppositesides of the `blade 'intern'iediate the -eutting edge fof .the blade and4the clamped portion thereof and prevent lateral Vdeflect-ion of tlieblade diari-ng lthe cutting operation.

ii. esciiMAN.

